# Physics 2 Online Quiz 2: Work, Energy, Power

15 Questions  I  By Sir_july
This quiz includes the topics on Work, Energy and Power. The quiz is consisting of 15 multiple-choice items, which are all conceptual. Time limit for the quiz is 15 minutes. Good luck.

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## Questions and Answers

 1 A feather and a coin are dropped in the air.  Each falls with equal _____.
 A. Momenta
 B. Kinetic energies
 C. Potential energy
 D. None of the above
 2 Two identical arrows, one with twice the kinetic energy of the other, are fired into a hay bale.  The faster arrow will penetrate _____.
 A. The same distance as the slower arrow.
 B. Twice as far as the slower arrow.
 C. Four times as far as the slower arrow.
 D. More than four times as far as the slower arrow.
 3 An object that has kinetic energy must be _____.
 A. Moving.
 B. Falling.
 C. At an elevated position.
 D. At rest.
 4 An object is raised above the ground gaining a certain amount of potential energy.  If the same object is raised twice as high it gains _____.
 A. Four times as much potential energy.
 B. Twice as much potential energy.
 C. Half as much potential energy
 D. Neither of these.
 5 Car A has a mass of 1000 kg and a speed of 60 km/h, and car B has a mass of 2000 kg and a speed of 30 km/h.  The kinetic energy of car A is _____.
 A. Half that of car B
 B. Equal that of car B
 C. Twice that of car B
 D. Four times that of car B
 6 If an object has kinetic energy, then it also must have _____.
 A. Speed
 B. Impulse
 C. Acceleration
 D. Force
 7 An object that has potential energy has this energy because of its _____.
 A. Speed.
 B. Acceleration.
 C. Momentum.
 D. Location.
 8 When a bullet is fired from a rifle, the force on the rifle is equal to the force on the bullet.  However, the energy of the bullet is greater than the energy of the recoiling rifle because the _______.
 A. Force on the bullet acts for a longer distance
 B. Bullet's momentum is greater than that of the rifle
 C. Force on the bullet acts for a longer time
 D. The impulse of the bullet is more
 9 How many Joules of energy are in one kilowatt-hour?
 A. 1 J
 B. 60 J
 C. 60 kilojoules
 D. 3.6 megajoules
 10 A ball is projected into the air with 100 J of kinetic energy which is transformed to gravitational potential energy at the top of its trajectory.  When it returns to its original level after encountering air resistance, its kinetic energy is _____.
 A. Less than 100 J.
 B. More than 100 J.
 C. 100 J.
 D. Not enough information given.
 11 When an object is lifted 10 meters, it gains a certain amount of potential energy. If the same object is lifted 20 meters, its potential energy is ______.
 A. Less.
 B. The same
 C. Twice as much.
 D. Four times as much
 12 Two identical arrows, one with twice the speed of the other, are fired into a hay bale.  The faster arrow will penetrate _____.
 A. The same distance as the slower arrow.
 B. Twice as far as the slower arrow.
 C. Four times as far as the slower arrow.
 D. More than four times as far as the slower arrow.
 13 Strictly speaking, a car will burn more gasoline if the car radio is turned on.  This statement is _____.
 A. Totally false.
 B. True only if the car's engine is running.
 C. True only if the car's engine is stopped.
 D. Always true.
 14 Which of the following is not a unit for power?
 A. Joule – second
 B. Watt
 C. Newton-meter per second
 D. Horsepower
 15 A feather and a coin dropped in a vacuum fall with equal _____.
 A. Forces
 B. Momenta
 C. Accelerations
 D. Kinetic energies
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